/* Sticky navbar + mobile menu styles */
/* ============================================
   NAVBAR
   ============================================ */

.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--navbar-h);
  z-index: var(--z-sticky);
  transition: background 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.navbar-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: rgba(248,250,252,0.80);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 var(--sp-8);
  transition: background 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

[data-theme="dark"] .navbar-inner {
  background: rgba(13,17,23,0.85);
}

.navbar.scrolled .navbar-inner {
  box-shadow: var(--shadow-md);
}

/* ── Logo ── */
.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
  flex-shrink: 0;
}

.navbar-logo-icon {
  width: 40px; height: 40px;
  display: block;
  object-fit: contain;
  border-radius: 8px;
  flex-shrink: 0;
  transition: transform 0.3s var(--ease-spring);
}

.navbar-logo:hover .navbar-logo-icon {
  transform: rotate(-8deg) scale(1.08);
}

.navbar-logo-text {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--txt-primary);
  letter-spacing: -0.02em;
  line-height: 1;
}

.navbar-logo-text span {
  color: var(--clr-primary);
}

/* ── Nav Links ── */
.navbar-links {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.navbar-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--txt-secondary);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-full);
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}

.navbar-link:hover {
  color: var(--txt-primary);
  background: var(--border-subtle);
}

/* ── Nav Actions ── */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

/* ── Theme Toggle ── */
.theme-toggle {
  width: 40px; height: 40px;
  border-radius: var(--r-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--txt-secondary);
  background: var(--border-subtle);
  border: 1px solid var(--border-medium);
  transition: all 0.2s var(--ease-out);
  font-size: 1.1rem;
}

.theme-toggle:hover {
  background: var(--border-medium);
  color: var(--txt-primary);
  transform: rotate(20deg);
}

/* ── Hamburger ── */
.hamburger {
  display: none;
  width: 40px; height: 40px;
  border-radius: var(--r-md);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  background: var(--border-subtle);
  border: 1px solid var(--border-medium);
  cursor: pointer;
  padding: 10px;
  transition: background 0.2s;
}

.hamburger:hover { background: var(--border-medium); }

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--txt-primary);
  border-radius: 2px;
  transition: all 0.3s var(--ease-out);
  transform-origin: center;
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Mobile Menu ── */
.mobile-menu {
  position: fixed;
  top: var(--navbar-h); left: 0; right: 0;
  background: var(--clr-surface);
  border-bottom: 1px solid var(--border-medium);
  padding: var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  z-index: calc(var(--z-sticky) - 1);
  transform: translateY(-110%);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: transform 0.35s var(--ease-out), opacity 0.25s var(--ease-out), visibility 0.25s;
  box-shadow: var(--shadow-lg);
}

.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mobile-menu .navbar-link {
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--r-md);
}

@media (max-width: 768px) {
  .navbar-links { display: none; }
  .hamburger { display: flex; }
  .navbar-inner { padding: 0 var(--sp-4); }
  
  /* Blur background when mobile menu is open */
  body.menu-open {
    overflow: hidden;
  }
  
  body.menu-open::before {
    content: '';
    position: fixed;
    inset: var(--navbar-h) 0 0 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: calc(var(--z-sticky) - 2);
    pointer-events: auto;
  }
}

@media (max-width: 480px) {
  .navbar-logo-text { display: none; }
}